Comments

I’m trying to enter your giveaway with the vitacost gift certificates and it’s not letting me leave a comment. I left one this morning and thought maybe server was busy, tried again and getting the same message:
Fatal error: Allowed memory size of 50331648 bytes exhausted (tried to allocate 71 bytes) in /home/moneys9/public_html/wp-includes/comment.php on line 1941
Not sure what this means? How do I leave more comments?